The shifting of the air bubble is adjusted using a spherometer in Searle's apparatus. If the screw moves through $2 \mathrm{mm}$ in two rotations and there are $100$ divisions on its circular scale then what will be its least count?

In the following passage there are blanks, each of which has been numbered. There are questions given below the passage and for each question, four words are suggested, one of which fits the blank appropriately. Find out the appropriate word in each case.

Whenever I go into a bank, I feel scared. Everybody and everything that I see there (1) ____ me. As for the manager the sight (2) ____ him simply terrifies me and (3) ____ me want to runaway (4) _____ I can. As soon as I (5) ____ the door of the bank I lose my head (6) ____ when I try to do any (7) ____ there, I behave like an idiot. I cannot explain (8) ____ for this but that is how it (9) ____ has been that is how it is (10) ____.

Select the most appropriate option for blank No. 10.

Consider the following reaction scheme and choose the correct option(s) for the major products Q, R and S.

For given diagram choose the correct option for $X$, $Y$, and $Z$:

In the following reactions, P, Q, R and S are the major products.

The correct statement(s) about P, Q, R and S is(are)

Considering the reaction sequence given below, the correct statement(s) is(are)